Manufacture of fuse.



STATES PATENT oF roE.

HENRY E. ELLSWORTH, OF SIMSBURY, CONNECTICUT, ASSIGNOR TO THE ENSIGN-BICKFORD COMPANY, OF SIMSBURY, CONNECTICUT, A CORPORATION OF CONNECTICUT.

MANUFACTURE OF FUSE Specification of Letters Patent.

Patented May 4, 1909.

Application filed February 17, 1909. Serial No. 478,447.

' ing drawings, forming a part hereof.

This invention relates to im rovements in the manufacture of fuse an especially of fuse embodying the invention set forth in my application for U. S. Letters Patent filed May 4, 1908 and serially numbered 430,689. In that application I have shown and described a continuous fuse which will not fire through or spit and which is accordingly adapted for use in such cases as where a charge is required to be fired from the bottom of a long hole. In such cases the fuse is often lead through the powder for a considerable distance and obviously should not communicate any fire to the powder except at the end of the fuse. Fuse embodying said invention may be manufactured in different ways, but the present method of manufacture is particularly adapted to produce a finished fuse of the desired quality.

In accordance with the present invention, cotton yarns or the like are first impregnated with a fire proofing liquid such as a solution of sodium silicate diluted with hot water to 27 Baum and are then spun about the powder or other fire-conveying medium. It matters not whether the spinning is done in the ordinary manner by feeding the powder in its natural state into the impregnated threads as they are being spun; or whether first a core of powder is provided, such as could be done by incasing the powder in a small cotton envelop and striking it in with asphaltum, which core is then over-spun by the impregnated yarns. In both cases the result is the same. After the spinning operation, the fuse is passed through asphaltum or some other suitable varnish and closely wiped, a step known as striking in, for the purpose of cementing the spinning threads together and of giving a goo foundation for a water proof coating. i

In order to impart the water proofing qualities to the fuse, a gutta percha mixture is next a plied in any well known manner. Finally t 1e fuse is finished by countering it with a number of strands of cotton yarn and 'by passing the countered fuse through some suitable'finishing material as for instance a mixtureof china clay or glue.

It will be obvious that the Water proofing is not an essential step of the present method and that the finishing process may be varied without departing from the spirit of the invention. v

I claim as my invention:

1. The method of manufacturing fuse, which consists in treating the spinning yarns to render them fire proof, and spinning the yarns about the fire-conveying medium.

2, The method of manufacturing fuse, which consists in treating yarns to render them fire proof, spinning the yarns about the fire-conveying medium, striking in with a varnish, and then countering the fuse.

3. The method of producing fuse described herein, which method comprises the feeding into a fire proof substance of a medium for conveying the fire.

4. The method of producing fuse described herein, which method comprises the s inning of fire proof strands about a medium or con- 11E. RY ELLSWORTH.

Signed in the presence of- ROBERT DARLING, V CHAS. A. BUERMAN. 

